Burglar-alarm sash-lock.



M. WILEL-ILER.v

BURGLAR ALARM. BASH LOOK.

APPLICATION FILED APBHZG, 1909.

Patented Nov. 8, 1910.

Jay;

MORRIS WHEELER, OF CHICAGO, ILLINOIS.

BURGLAR-ALARM SASI-I-LOCK.

Specification of Letters Patent.

Patented Nov. 8, 1910.

Application filed April 28, 1909. SeiiaI No. 492,212.

To all whom it may concern:

Be it known that I, Monms -Wiinnnnn, a citizen of the United States,residing 111 Chicago, in the county of Cook and State of.

Illinois, have invented certain new and use ful Improvements inBurglar-Alarm Sash- Locks, of which the following is a full and correctspecification, reference being had to the hereto-accompanying drawing,forming a part hereof, and in which Figure 1 shows a fragment of awindowsash in outline and the window-frame and lock in section on thecutting plane 1, 1, of Fig. 2. Fig. 2 shows the window-frame in faceview. Fig. 3 is a diagrammatic illustration of my said device.

Like reference letters denote like parts throughout.

The object of my invention is to provide a sash-lock in combination withan electrically actuated alarm mechanism which is so arranged andconstructed that any motion in the direction of opening the sash willcause the alarm to sound, also to permit setting the sash forventilation, as for bed-rooms, to such a point as will still prevententrance without moving the sash, and when moved, cause the alarm tosound. To attain said desirable ends I construct and apply my said newdevice in substantially the following manner, to wit:

I provide a metal casing A having a face plate 7) and to said casing areattached binding-posts e (Z whereof thelatter is insulated at e on eachside of said casing and held by a screw which passes through an enlargedhole g in said casing and thereby prevents contact of said screw withthe casing A and on the inside of said casing and on the head of saidscrew is placed a spring 70 which is insulated from the casing on itsedges and into said casing is placed an eccentric cam j which turns on ashaft h and on said shaft is wound a coiled spring 71 whereof one end isheld by the side of the casing, and said spring is provided with aspring-arm 6 under said cam, whereby said cam is lifted and contactswith the sash B whereby it is actuated when the sash is moved.

A chamber Z is cut out of the Window frame to make room for the bindingposts, and the contact-face of the cam j is provided with teeth m. Akey-post h on one end of the shaft 7L receives a key by means of whichsaid shaft and its cam may be moved against the pressure of the arm 2'to release the cam j from the sash B so that the latter may be operated.By simply inverting the part A it may be applied to an upper windowsash.

In Fig. 3 is shown a circuit D and in it the battery E, alarm C and lookA.

As shown in Fig. 1 the cam is contacting the spring 70 and thereby iscompleted the circuit through the screw f but when in normal positionsaid parts are not in contact and the circuit is broken.

hat I claim is:

The combination with a window frame and a sash therefor, of a metalliccasing on the window frame, a key operable shaft journaled in saidcasing, a cam on said shaftand contacting with said sash, acontact-spring held by and insulated from said casing, an electriccircuit connected to the contact-spring and to the casing, and an alarmin said circuit.

MORRIS WHEELER. Witnesses JOHN P. MARSH, WM. ZIMMERMAN.

